The Urban Dictionary T-Shirt

n. (slang) the spelling of the noise the noise a woman makes when recieving sexual pleasure, in one of it's many forms, such as "making out", "foreplay", a "tongue twister", or the actual act of intercourse. This phrase was featured in punk band "bloodhound gang"'s album "Hefty Fine" in the form of their song "uhn tiss, uhn tiss, uhn tiss".
This term occasionally refers to a mans reproductive organ.

Dark Oswin: Hey, 007aleta, i got something, and it goes thumpin like this, all you need is my uhn tiss.

007aleta: What the f#$@?

Dark Oswin: Do i have to spell it out for you bitch? I can penetrate you, all you need is my penis, you'll be singing "uhn tiss" before you know it.